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A137639
Triangle read by rows, A026794 * A051731.
1
1, 2, 1, 3, 0, 1, 5, 2, 0, 1, 7, 1, 0, 0, 1, 11, 3, 2, 0, 0, 1, 15, 2, 1, 0, 0, 0, 1, 22, 6, 1, 2, 0, 0, 0, 1, 30, 5, 3, 1, 0, 0, 0, 0, 1, 42, 9, 2, 1, 2, 0, 0, 0, 0, 1, 56, 9, 3, 1, 1, 0, 0, 0, 0, 0, 1, 77, 16, 6, 3, 1, 2, 0, 0, 0, 0, 0, 1
OFFSET
1,2
COMMENTS
Left border = A000041 starting with offset 1: (1, 2, 3, 5, 7, 11, 15, ...).
Row sums = A137640: (1, 3, 4, 8, 9, 17, 19, ...).
FORMULA
A026794 * A051731 as infinite lower triangular matrices.
EXAMPLE
First few rows of the triangle:
1;
2, 1;
3, 0, 1;
5, 2, 0, 1;
7, 1, 0, 0, 1;
11, 3, 2, 0, 0, 1;
15, 2, 1, 0, 0, 0, 1;
22, 6, 1, 2, 0, 0, 0, 1;
30, 5, 3, 1, 0, 0, 0, 0, 1;
...
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Jan 31 2008
STATUS
approved